# uncompyle6 version 3.2.3
# Python bytecode 3.6 (3379)
# Decompiled from: Python 3.6.8 |Anaconda custom (64-bit)| (default, Feb 21 2019, 18:30:04) [MSC v.1916 64 bit (AMD64)]
# Embedded file name: site-packages\cryptography\x509\extensions.py
from __future__ import absolute_import, division, print_function
import abc, datetime, hashlib, ipaddress
from enum import Enum
from asn1crypto.keys import PublicKeyInfo
import six
from cryptography import utils
from cryptography.hazmat.primitives import constant_time, serialization
from cryptography.hazmat.primitives.asymmetric.ec import EllipticCurvePublicKey
from cryptography.hazmat.primitives.asymmetric.rsa import RSAPublicKey
from cryptography.x509.certificate_transparency import SignedCertificateTimestamp
from cryptography.x509.general_name import GeneralName, IPAddress, OtherName
from cryptography.x509.name import RelativeDistinguishedName
from cryptography.x509.oid import CRLEntryExtensionOID, ExtensionOID, ObjectIdentifier


def _key_identifier_from_public_key(public_key):
    if isinstance(public_key, RSAPublicKey):
        data = public_key.public_bytes(
            serialization.Encoding.DER, serialization.PublicFormat.PKCS1
        )
    else:
        if isinstance(public_key, EllipticCurvePublicKey):
            data = public_key.public_numbers().encode_point()
        else:
            serialized = public_key.public_bytes(
                serialization.Encoding.DER,
                serialization.PublicFormat.SubjectPublicKeyInfo,
            )
            data = six.binary_type(PublicKeyInfo.load(serialized)["public_key"])
        return hashlib.sha1(data).digest()


class DuplicateExtension(Exception):
    def __init__(self, msg, oid):
        super(DuplicateExtension, self).__init__(msg)
        self.oid = oid


class ExtensionNotFound(Exception):
    def __init__(self, msg, oid):
        super(ExtensionNotFound, self).__init__(msg)
        self.oid = oid


@six.add_metaclass(abc.ABCMeta)
class ExtensionType(object):
    @abc.abstractproperty
    def oid(self):
        """
        Returns the oid associated with the given extension type.
        """
        pass


class Extensions(object):
    def __init__(self, extensions):
        self._extensions = extensions

    def get_extension_for_oid(self, oid):
        for ext in self:
            if ext.oid == oid:
                return ext

        raise ExtensionNotFound(("No {0} extension was found").format(oid), oid)

    def get_extension_for_class(self, extclass):
        if extclass is UnrecognizedExtension:
            raise TypeError(
                "UnrecognizedExtension can't be used with get_extension_for_class because more than one instance of the class may be present."
            )
        for ext in self:
            if isinstance(ext.value, extclass):
                return ext

        raise ExtensionNotFound(
            ("No {0} extension was found").format(extclass), extclass.oid
        )

    def __iter__(self):
        return iter(self._extensions)

    def __len__(self):
        return len(self._extensions)

    def __getitem__(self, idx):
        return self._extensions[idx]

    def __repr__(self):
        return ("<Extensions({0})>").format(self._extensions)


@utils.register_interface(ExtensionType)
class CRLNumber(object):
    oid = ExtensionOID.CRL_NUMBER

    def __init__(self, crl_number):
        if not isinstance(crl_number, six.integer_types):
            raise TypeError("crl_number must be an integer")
        self._crl_number = crl_number

    def __eq__(self, other):
        if not isinstance(other, CRLNumber):
            return NotImplemented
        else:
            return self.crl_number == other.crl_number

    def __ne__(self, other):
        return not self == other

    def __hash__(self):
        return hash(self.crl_number)

    def __repr__(self):
        return ("<CRLNumber({0})>").format(self.crl_number)

    crl_number = utils.read_only_property("_crl_number")


@utils.register_interface(ExtensionType)
class AuthorityKeyIdentifier(object):
    oid = ExtensionOID.AUTHORITY_KEY_IDENTIFIER

    def __init__(
        self, key_identifier, authority_cert_issuer, authority_cert_serial_number
    ):
        if (authority_cert_issuer is None) != (authority_cert_serial_number is None):
            raise ValueError(
                "authority_cert_issuer and authority_cert_serial_number must both be present or both None"
            )
        if authority_cert_issuer is not None:
            authority_cert_issuer = list(authority_cert_issuer)
            if not all((isinstance(x, GeneralName) for x in authority_cert_issuer)):
                raise TypeError(
                    "authority_cert_issuer must be a list of GeneralName objects"
                )
        if authority_cert_serial_number is not None:
            if not isinstance(authority_cert_serial_number, six.integer_types):
                raise TypeError("authority_cert_serial_number must be an integer")
        self._key_identifier = key_identifier
        self._authority_cert_issuer = authority_cert_issuer
        self._authority_cert_serial_number = authority_cert_serial_number

    @classmethod
    def from_issuer_public_key(cls, public_key):
        digest = _key_identifier_from_public_key(public_key)
        return cls(
            key_identifier=digest,
            authority_cert_issuer=None,
            authority_cert_serial_number=None,
        )

    @classmethod
    def from_issuer_subject_key_identifier(cls, ski):
        return cls(
            key_identifier=ski.value.digest,
            authority_cert_issuer=None,
            authority_cert_serial_number=None,
        )

    def __repr__(self):
        return (
            "<AuthorityKeyIdentifier(key_identifier={0.key_identifier!r}, authority_cert_issuer={0.authority_cert_issuer}, authority_cert_serial_number={0.authority_cert_serial_number})>"
        ).format(self)

    def __eq__(self, other):
        if not isinstance(other, AuthorityKeyIdentifier):
            return NotImplemented
        else:
            return (
                self.key_identifier == other.key_identifier
                and self.authority_cert_issuer == other.authority_cert_issuer
                and self.authority_cert_serial_number
                == other.authority_cert_serial_number
            )

    def __ne__(self, other):
        return not self == other

    def __hash__(self):
        if self.authority_cert_issuer is None:
            aci = None
        else:
            aci = tuple(self.authority_cert_issuer)
        return hash((self.key_identifier, aci, self.authority_cert_serial_number))

    key_identifier = utils.read_only_property("_key_identifier")
    authority_cert_issuer = utils.read_only_property("_authority_cert_issuer")
    authority_cert_serial_number = utils.read_only_property(
        "_authority_cert_serial_number"
    )


@utils.register_interface(ExtensionType)
class SubjectKeyIdentifier(object):
    oid = ExtensionOID.SUBJECT_KEY_IDENTIFIER

    def __init__(self, digest):
        self._digest = digest

    @classmethod
    def from_public_key(cls, public_key):
        return cls(_key_identifier_from_public_key(public_key))

    digest = utils.read_only_property("_digest")

    def __repr__(self):
        return ("<SubjectKeyIdentifier(digest={0!r})>").format(self.digest)

    def __eq__(self, other):
        if not isinstance(other, SubjectKeyIdentifier):
            return NotImplemented
        else:
            return constant_time.bytes_eq(self.digest, other.digest)

    def __ne__(self, other):
        return not self == other

    def __hash__(self):
        return hash(self.digest)


@utils.register_interface(ExtensionType)
class AuthorityInformationAccess(object):
    oid = ExtensionOID.AUTHORITY_INFORMATION_ACCESS

    def __init__(self, descriptions):
        descriptions = list(descriptions)
        if not all((isinstance(x, AccessDescription) for x in descriptions)):
            raise TypeError(
                "Every item in the descriptions list must be an AccessDescription"
            )
        self._descriptions = descriptions

    def __iter__(self):
        return iter(self._descriptions)

    def __len__(self):
        return len(self._descriptions)

    def __repr__(self):
        return ("<AuthorityInformationAccess({0})>").format(self._descriptions)

    def __eq__(self, other):
        if not isinstance(other, AuthorityInformationAccess):
            return NotImplemented
        else:
            return self._descriptions == other._descriptions

    def __ne__(self, other):
        return not self == other

    def __getitem__(self, idx):
        return self._descriptions[idx]

    def __hash__(self):
        return hash(tuple(self._descriptions))


class AccessDescription(object):
    def __init__(self, access_method, access_location):
        if not isinstance(access_method, ObjectIdentifier):
            raise TypeError("access_method must be an ObjectIdentifier")
        if not isinstance(access_location, GeneralName):
            raise TypeError("access_location must be a GeneralName")
        self._access_method = access_method
        self._access_location = access_location

    def __repr__(self):
        return (
            "<AccessDescription(access_method={0.access_method}, access_location={0.access_location})>"
        ).format(self)

    def __eq__(self, other):
        if not isinstance(other, AccessDescription):
            return NotImplemented
        else:
            return (
                self.access_method == other.access_method
                and self.access_location == other.access_location
            )

    def __ne__(self, other):
        return not self == other

    def __hash__(self):
        return hash((self.access_method, self.access_location))

    access_method = utils.read_only_property("_access_method")
    access_location = utils.read_only_property("_access_location")


@utils.register_interface(ExtensionType)
class BasicConstraints(object):
    oid = ExtensionOID.BASIC_CONSTRAINTS

    def __init__(self, ca, path_length):
        if not isinstance(ca, bool):
            raise TypeError("ca must be a boolean value")
        if path_length is not None:
            if not ca:
                raise ValueError("path_length must be None when ca is False")
        if path_length is not None:
            if not isinstance(path_length, six.integer_types) or path_length < 0:
                raise TypeError("path_length must be a non-negative integer or None")
        self._ca = ca
        self._path_length = path_length

    ca = utils.read_only_property("_ca")
    path_length = utils.read_only_property("_path_length")

    def __repr__(self):
        return ("<BasicConstraints(ca={0.ca}, path_length={0.path_length})>").format(
            self
        )

    def __eq__(self, other):
        if not isinstance(other, BasicConstraints):
            return NotImplemented
        else:
            return self.ca == other.ca and self.path_length == other.path_length

    def __ne__(self, other):
        return not self == other

    def __hash__(self):
        return hash((self.ca, self.path_length))


@utils.register_interface(ExtensionType)
class DeltaCRLIndicator(object):
    oid = ExtensionOID.DELTA_CRL_INDICATOR

    def __init__(self, crl_number):
        if not isinstance(crl_number, six.integer_types):
            raise TypeError("crl_number must be an integer")
        self._crl_number = crl_number

    crl_number = utils.read_only_property("_crl_number")

    def __eq__(self, other):
        if not isinstance(other, DeltaCRLIndicator):
            return NotImplemented
        else:
            return self.crl_number == other.crl_number

    def __ne__(self, other):
        return not self == other

    def __hash__(self):
        return hash(self.crl_number)

    def __repr__(self):
        return ("<DeltaCRLIndicator(crl_number={0.crl_number})>").format(self)


@utils.register_interface(ExtensionType)
class CRLDistributionPoints(object):
    oid = ExtensionOID.CRL_DISTRIBUTION_POINTS

    def __init__(self, distribution_points):
        distribution_points = list(distribution_points)
        if not all((isinstance(x, DistributionPoint) for x in distribution_points)):
            raise TypeError(
                "distribution_points must be a list of DistributionPoint objects"
            )
        self._distribution_points = distribution_points

    def __iter__(self):
        return iter(self._distribution_points)

    def __len__(self):
        return len(self._distribution_points)

    def __repr__(self):
        return ("<CRLDistributionPoints({0})>").format(self._distribution_points)

    def __eq__(self, other):
        if not isinstance(other, CRLDistributionPoints):
            return NotImplemented
        else:
            return self._distribution_points == other._distribution_points

    def __ne__(self, other):
        return not self == other

    def __getitem__(self, idx):
        return self._distribution_points[idx]

    def __hash__(self):
        return hash(tuple(self._distribution_points))


@utils.register_interface(ExtensionType)
class FreshestCRL(object):
    oid = ExtensionOID.FRESHEST_CRL

    def __init__(self, distribution_points):
        distribution_points = list(distribution_points)
        if not all((isinstance(x, DistributionPoint) for x in distribution_points)):
            raise TypeError(
                "distribution_points must be a list of DistributionPoint objects"
            )
        self._distribution_points = distribution_points

    def __iter__(self):
        return iter(self._distribution_points)

    def __len__(self):
        return len(self._distribution_points)

    def __repr__(self):
        return ("<FreshestCRL({0})>").format(self._distribution_points)

    def __eq__(self, other):
        if not isinstance(other, FreshestCRL):
            return NotImplemented
        else:
            return self._distribution_points == other._distribution_points

    def __ne__(self, other):
        return not self == other

    def __getitem__(self, idx):
        return self._distribution_points[idx]

    def __hash__(self):
        return hash(tuple(self._distribution_points))


class DistributionPoint(object):
    def __init__(self, full_name, relative_name, reasons, crl_issuer):
        if full_name:
            if relative_name:
                raise ValueError(
                    "You cannot provide both full_name and relative_name, at least one must be None."
                )
        if full_name:
            full_name = list(full_name)
            if not all((isinstance(x, GeneralName) for x in full_name)):
                raise TypeError("full_name must be a list of GeneralName objects")
        if relative_name:
            if not isinstance(relative_name, RelativeDistinguishedName):
                raise TypeError("relative_name must be a RelativeDistinguishedName")
        if crl_issuer:
            crl_issuer = list(crl_issuer)
            if not all((isinstance(x, GeneralName) for x in crl_issuer)):
                raise TypeError("crl_issuer must be None or a list of general names")
        if reasons:
            if not isinstance(reasons, frozenset) or not all(
                (isinstance(x, ReasonFlags) for x in reasons)
            ):
                raise TypeError("reasons must be None or frozenset of ReasonFlags")
        if reasons:
            if (
                ReasonFlags.unspecified in reasons
                or ReasonFlags.remove_from_crl in reasons
            ):
                raise ValueError(
                    "unspecified and remove_from_crl are not valid reasons in a DistributionPoint"
                )
        if reasons:
            if not crl_issuer:
                if not (full_name or relative_name):
                    raise ValueError(
                        "You must supply crl_issuer, full_name, or relative_name when reasons is not None"
                    )
        self._full_name = full_name
        self._relative_name = relative_name
        self._reasons = reasons
        self._crl_issuer = crl_issuer

    def __repr__(self):
        return (
            "<DistributionPoint(full_name={0.full_name}, relative_name={0.relative_name}, reasons={0.reasons}, crl_issuer={0.crl_issuer})>"
        ).format(self)

    def __eq__(self, other):
        if not isinstance(other, DistributionPoint):
            return NotImplemented
        else:
            return (
                self.full_name == other.full_name
                and self.relative_name == other.relative_name
                and self.reasons == other.reasons
                and self.crl_issuer == other.crl_issuer
            )

    def __ne__(self, other):
        return not self == other

    def __hash__(self):
        if self.full_name is not None:
            fn = tuple(self.full_name)
        else:
            fn = None
        if self.crl_issuer is not None:
            crl_issuer = tuple(self.crl_issuer)
        else:
            crl_issuer = None
        return hash((fn, self.relative_name, self.reasons, crl_issuer))

    full_name = utils.read_only_property("_full_name")
    relative_name = utils.read_only_property("_relative_name")
    reasons = utils.read_only_property("_reasons")
    crl_issuer = utils.read_only_property("_crl_issuer")


class ReasonFlags(Enum):
    unspecified = "unspecified"
    key_compromise = "keyCompromise"
    ca_compromise = "cACompromise"
    affiliation_changed = "affiliationChanged"
    superseded = "superseded"
    cessation_of_operation = "cessationOfOperation"
    certificate_hold = "certificateHold"
    privilege_withdrawn = "privilegeWithdrawn"
    aa_compromise = "aACompromise"
    remove_from_crl = "removeFromCRL"


@utils.register_interface(ExtensionType)
class PolicyConstraints(object):
    oid = ExtensionOID.POLICY_CONSTRAINTS

    def __init__(self, require_explicit_policy, inhibit_policy_mapping):
        if require_explicit_policy is not None:
            if not isinstance(require_explicit_policy, six.integer_types):
                raise TypeError(
                    "require_explicit_policy must be a non-negative integer or None"
                )
        if inhibit_policy_mapping is not None:
            if not isinstance(inhibit_policy_mapping, six.integer_types):
                raise TypeError(
                    "inhibit_policy_mapping must be a non-negative integer or None"
                )
        if inhibit_policy_mapping is None:
            if require_explicit_policy is None:
                raise ValueError(
                    "At least one of require_explicit_policy and inhibit_policy_mapping must not be None"
                )
        self._require_explicit_policy = require_explicit_policy
        self._inhibit_policy_mapping = inhibit_policy_mapping

    def __repr__(self):
        return (
            "<PolicyConstraints(require_explicit_policy={0.require_explicit_policy}, inhibit_policy_mapping={0.inhibit_policy_mapping})>"
        ).format(self)

    def __eq__(self, other):
        if not isinstance(other, PolicyConstraints):
            return NotImplemented
        else:
            return (
                self.require_explicit_policy == other.require_explicit_policy
                and self.inhibit_policy_mapping == other.inhibit_policy_mapping
            )

    def __ne__(self, other):
        return not self == other

    def __hash__(self):
        return hash((self.require_explicit_policy, self.inhibit_policy_mapping))

    require_explicit_policy = utils.read_only_property("_require_explicit_policy")
    inhibit_policy_mapping = utils.read_only_property("_inhibit_policy_mapping")


@utils.register_interface(ExtensionType)
class CertificatePolicies(object):
    oid = ExtensionOID.CERTIFICATE_POLICIES

    def __init__(self, policies):
        policies = list(policies)
        if not all((isinstance(x, PolicyInformation) for x in policies)):
            raise TypeError(
                "Every item in the policies list must be a PolicyInformation"
            )
        self._policies = policies

    def __iter__(self):
        return iter(self._policies)

    def __len__(self):
        return len(self._policies)

    def __repr__(self):
        return ("<CertificatePolicies({0})>").format(self._policies)

    def __eq__(self, other):
        if not isinstance(other, CertificatePolicies):
            return NotImplemented
        else:
            return self._policies == other._policies

    def __ne__(self, other):
        return not self == other

    def __getitem__(self, idx):
        return self._policies[idx]

    def __hash__(self):
        return hash(tuple(self._policies))


class PolicyInformation(object):
    def __init__(self, policy_identifier, policy_qualifiers):
        if not isinstance(policy_identifier, ObjectIdentifier):
            raise TypeError("policy_identifier must be an ObjectIdentifier")
        self._policy_identifier = policy_identifier
        if policy_qualifiers:
            policy_qualifiers = list(policy_qualifiers)
            if not all(
                (isinstance(x, (six.text_type, UserNotice)) for x in policy_qualifiers)
            ):
                raise TypeError(
                    "policy_qualifiers must be a list of strings and/or UserNotice objects or None"
                )
        self._policy_qualifiers = policy_qualifiers

    def __repr__(self):
        return (
            "<PolicyInformation(policy_identifier={0.policy_identifier}, policy_qualifiers={0.policy_qualifiers})>"
        ).format(self)

    def __eq__(self, other):
        if not isinstance(other, PolicyInformation):
            return NotImplemented
        else:
            return (
                self.policy_identifier == other.policy_identifier
                and self.policy_qualifiers == other.policy_qualifiers
            )

    def __ne__(self, other):
        return not self == other

    def __hash__(self):
        if self.policy_qualifiers is not None:
            pq = tuple(self.policy_qualifiers)
        else:
            pq = None
        return hash((self.policy_identifier, pq))

    policy_identifier = utils.read_only_property("_policy_identifier")
    policy_qualifiers = utils.read_only_property("_policy_qualifiers")


class UserNotice(object):
    def __init__(self, notice_reference, explicit_text):
        if notice_reference:
            if not isinstance(notice_reference, NoticeReference):
                raise TypeError("notice_reference must be None or a NoticeReference")
        self._notice_reference = notice_reference
        self._explicit_text = explicit_text

    def __repr__(self):
        return (
            "<UserNotice(notice_reference={0.notice_reference}, explicit_text={0.explicit_text!r})>"
        ).format(self)

    def __eq__(self, other):
        if not isinstance(other, UserNotice):
            return NotImplemented
        else:
            return (
                self.notice_reference == other.notice_reference
                and self.explicit_text == other.explicit_text
            )

    def __ne__(self, other):
        return not self == other

    def __hash__(self):
        return hash((self.notice_reference, self.explicit_text))

    notice_reference = utils.read_only_property("_notice_reference")
    explicit_text = utils.read_only_property("_explicit_text")


class NoticeReference(object):
    def __init__(self, organization, notice_numbers):
        self._organization = organization
        notice_numbers = list(notice_numbers)
        if not all((isinstance(x, int) for x in notice_numbers)):
            raise TypeError("notice_numbers must be a list of integers")
        self._notice_numbers = notice_numbers

    def __repr__(self):
        return (
            "<NoticeReference(organization={0.organization!r}, notice_numbers={0.notice_numbers})>"
        ).format(self)

    def __eq__(self, other):
        if not isinstance(other, NoticeReference):
            return NotImplemented
        else:
            return (
                self.organization == other.organization
                and self.notice_numbers == other.notice_numbers
            )

    def __ne__(self, other):
        return not self == other

    def __hash__(self):
        return hash((self.organization, tuple(self.notice_numbers)))

    organization = utils.read_only_property("_organization")
    notice_numbers = utils.read_only_property("_notice_numbers")


@utils.register_interface(ExtensionType)
class ExtendedKeyUsage(object):
    oid = ExtensionOID.EXTENDED_KEY_USAGE

    def __init__(self, usages):
        usages = list(usages)
        if not all((isinstance(x, ObjectIdentifier) for x in usages)):
            raise TypeError("Every item in the usages list must be an ObjectIdentifier")
        self._usages = usages

    def __iter__(self):
        return iter(self._usages)

    def __len__(self):
        return len(self._usages)

    def __repr__(self):
        return ("<ExtendedKeyUsage({0})>").format(self._usages)

    def __eq__(self, other):
        if not isinstance(other, ExtendedKeyUsage):
            return NotImplemented
        else:
            return self._usages == other._usages

    def __ne__(self, other):
        return not self == other

    def __hash__(self):
        return hash(tuple(self._usages))


@utils.register_interface(ExtensionType)
class OCSPNoCheck(object):
    oid = ExtensionOID.OCSP_NO_CHECK


@utils.register_interface(ExtensionType)
class TLSFeature(object):
    oid = ExtensionOID.TLS_FEATURE

    def __init__(self, features):
        features = list(features)
        if (
            not all((isinstance(x, TLSFeatureType) for x in features))
            or len(features) == 0
        ):
            raise TypeError(
                "features must be a list of elements from the TLSFeatureType enum"
            )
        self._features = features

    def __iter__(self):
        return iter(self._features)

    def __len__(self):
        return len(self._features)

    def __repr__(self):
        return ("<TLSFeature(features={0._features})>").format(self)

    def __eq__(self, other):
        if not isinstance(other, TLSFeature):
            return NotImplemented
        else:
            return self._features == other._features

    def __getitem__(self, idx):
        return self._features[idx]

    def __ne__(self, other):
        return not self == other

    def __hash__(self):
        return hash(tuple(self._features))


class TLSFeatureType(Enum):
    status_request = 5
    status_request_v2 = 17


_TLS_FEATURE_TYPE_TO_ENUM = dict(((x.value, x) for x in TLSFeatureType))


@utils.register_interface(ExtensionType)
class InhibitAnyPolicy(object):
    oid = ExtensionOID.INHIBIT_ANY_POLICY

    def __init__(self, skip_certs):
        if not isinstance(skip_certs, six.integer_types):
            raise TypeError("skip_certs must be an integer")
        if skip_certs < 0:
            raise ValueError("skip_certs must be a non-negative integer")
        self._skip_certs = skip_certs

    def __repr__(self):
        return ("<InhibitAnyPolicy(skip_certs={0.skip_certs})>").format(self)

    def __eq__(self, other):
        if not isinstance(other, InhibitAnyPolicy):
            return NotImplemented
        else:
            return self.skip_certs == other.skip_certs

    def __ne__(self, other):
        return not self == other

    def __hash__(self):
        return hash(self.skip_certs)

    skip_certs = utils.read_only_property("_skip_certs")


@utils.register_interface(ExtensionType)
class KeyUsage(object):
    oid = ExtensionOID.KEY_USAGE

    def __init__(
        self,
        digital_signature,
        content_commitment,
        key_encipherment,
        data_encipherment,
        key_agreement,
        key_cert_sign,
        crl_sign,
        encipher_only,
        decipher_only,
    ):
        if not key_agreement:
            if encipher_only or decipher_only:
                raise ValueError(
                    "encipher_only and decipher_only can only be true when key_agreement is true"
                )
        self._digital_signature = digital_signature
        self._content_commitment = content_commitment
        self._key_encipherment = key_encipherment
        self._data_encipherment = data_encipherment
        self._key_agreement = key_agreement
        self._key_cert_sign = key_cert_sign
        self._crl_sign = crl_sign
        self._encipher_only = encipher_only
        self._decipher_only = decipher_only

    digital_signature = utils.read_only_property("_digital_signature")
    content_commitment = utils.read_only_property("_content_commitment")
    key_encipherment = utils.read_only_property("_key_encipherment")
    data_encipherment = utils.read_only_property("_data_encipherment")
    key_agreement = utils.read_only_property("_key_agreement")
    key_cert_sign = utils.read_only_property("_key_cert_sign")
    crl_sign = utils.read_only_property("_crl_sign")

    @property
    def encipher_only(self):
        if not self.key_agreement:
            raise ValueError("encipher_only is undefined unless key_agreement is true")
        else:
            return self._encipher_only

    @property
    def decipher_only(self):
        if not self.key_agreement:
            raise ValueError("decipher_only is undefined unless key_agreement is true")
        else:
            return self._decipher_only

    def __repr__(self):
        try:
            encipher_only = self.encipher_only
            decipher_only = self.decipher_only
        except ValueError:
            encipher_only = None
            decipher_only = None

        return (
            "<KeyUsage(digital_signature={0.digital_signature}, content_commitment={0.content_commitment}, key_encipherment={0.key_encipherment}, data_encipherment={0.data_encipherment}, key_agreement={0.key_agreement}, key_cert_sign={0.key_cert_sign}, crl_sign={0.crl_sign}, encipher_only={1}, decipher_only={2})>"
        ).format(self, encipher_only, decipher_only)

    def __eq__(self, other):
        if not isinstance(other, KeyUsage):
            return NotImplemented
        else:
            return (
                self.digital_signature == other.digital_signature
                and self.content_commitment == other.content_commitment
                and self.key_encipherment == other.key_encipherment
                and self.data_encipherment == other.data_encipherment
                and self.key_agreement == other.key_agreement
                and self.key_cert_sign == other.key_cert_sign
                and self.crl_sign == other.crl_sign
                and self._encipher_only == other._encipher_only
                and self._decipher_only == other._decipher_only
            )

    def __ne__(self, other):
        return not self == other

    def __hash__(self):
        return hash(
            (
                self.digital_signature,
                self.content_commitment,
                self.key_encipherment,
                self.data_encipherment,
                self.key_agreement,
                self.key_cert_sign,
                self.crl_sign,
                self._encipher_only,
                self._decipher_only,
            )
        )


@utils.register_interface(ExtensionType)
class NameConstraints(object):
    oid = ExtensionOID.NAME_CONSTRAINTS

    def __init__(self, permitted_subtrees, excluded_subtrees):
        if permitted_subtrees is not None:
            permitted_subtrees = list(permitted_subtrees)
            if not all((isinstance(x, GeneralName) for x in permitted_subtrees)):
                raise TypeError(
                    "permitted_subtrees must be a list of GeneralName objects or None"
                )
            self._validate_ip_name(permitted_subtrees)
        if excluded_subtrees is not None:
            excluded_subtrees = list(excluded_subtrees)
            if not all((isinstance(x, GeneralName) for x in excluded_subtrees)):
                raise TypeError(
                    "excluded_subtrees must be a list of GeneralName objects or None"
                )
            self._validate_ip_name(excluded_subtrees)
        if permitted_subtrees is None:
            if excluded_subtrees is None:
                raise ValueError(
                    "At least one of permitted_subtrees and excluded_subtrees must not be None"
                )
        self._permitted_subtrees = permitted_subtrees
        self._excluded_subtrees = excluded_subtrees

    def __eq__(self, other):
        if not isinstance(other, NameConstraints):
            return NotImplemented
        else:
            return (
                self.excluded_subtrees == other.excluded_subtrees
                and self.permitted_subtrees == other.permitted_subtrees
            )

    def __ne__(self, other):
        return not self == other

    def _validate_ip_name(self, tree):
        if any(
            (
                isinstance(name, IPAddress)
                and not isinstance(
                    name.value, (ipaddress.IPv4Network, ipaddress.IPv6Network)
                )
                for name in tree
            )
        ):
            raise TypeError(
                "IPAddress name constraints must be an IPv4Network or IPv6Network object"
            )

    def __repr__(self):
        return (
            "<NameConstraints(permitted_subtrees={0.permitted_subtrees}, excluded_subtrees={0.excluded_subtrees})>"
        ).format(self)

    def __hash__(self):
        if self.permitted_subtrees is not None:
            ps = tuple(self.permitted_subtrees)
        else:
            ps = None
        if self.excluded_subtrees is not None:
            es = tuple(self.excluded_subtrees)
        else:
            es = None
        return hash((ps, es))

    permitted_subtrees = utils.read_only_property("_permitted_subtrees")
    excluded_subtrees = utils.read_only_property("_excluded_subtrees")


class Extension(object):
    def __init__(self, oid, critical, value):
        if not isinstance(oid, ObjectIdentifier):
            raise TypeError("oid argument must be an ObjectIdentifier instance.")
        if not isinstance(critical, bool):
            raise TypeError("critical must be a boolean value")
        self._oid = oid
        self._critical = critical
        self._value = value

    oid = utils.read_only_property("_oid")
    critical = utils.read_only_property("_critical")
    value = utils.read_only_property("_value")

    def __repr__(self):
        return (
            "<Extension(oid={0.oid}, critical={0.critical}, value={0.value})>"
        ).format(self)

    def __eq__(self, other):
        if not isinstance(other, Extension):
            return NotImplemented
        else:
            return (
                self.oid == other.oid
                and self.critical == other.critical
                and self.value == other.value
            )

    def __ne__(self, other):
        return not self == other

    def __hash__(self):
        return hash((self.oid, self.critical, self.value))


class GeneralNames(object):
    def __init__(self, general_names):
        general_names = list(general_names)
        if not all((isinstance(x, GeneralName) for x in general_names)):
            raise TypeError(
                "Every item in the general_names list must be an object conforming to the GeneralName interface"
            )
        self._general_names = general_names

    def __iter__(self):
        return iter(self._general_names)

    def __len__(self):
        return len(self._general_names)

    def get_values_for_type(self, type):
        objs = (i for i in self if isinstance(i, type))
        if type != OtherName:
            objs = (i.value for i in objs)
        return list(objs)

    def __repr__(self):
        return ("<GeneralNames({0})>").format(self._general_names)

    def __eq__(self, other):
        if not isinstance(other, GeneralNames):
            return NotImplemented
        else:
            return self._general_names == other._general_names

    def __ne__(self, other):
        return not self == other

    def __getitem__(self, idx):
        return self._general_names[idx]

    def __hash__(self):
        return hash(tuple(self._general_names))


@utils.register_interface(ExtensionType)
class SubjectAlternativeName(object):
    oid = ExtensionOID.SUBJECT_ALTERNATIVE_NAME

    def __init__(self, general_names):
        self._general_names = GeneralNames(general_names)

    def __iter__(self):
        return iter(self._general_names)

    def __len__(self):
        return len(self._general_names)

    def get_values_for_type(self, type):
        return self._general_names.get_values_for_type(type)

    def __repr__(self):
        return ("<SubjectAlternativeName({0})>").format(self._general_names)

    def __eq__(self, other):
        if not isinstance(other, SubjectAlternativeName):
            return NotImplemented
        else:
            return self._general_names == other._general_names

    def __getitem__(self, idx):
        return self._general_names[idx]

    def __ne__(self, other):
        return not self == other

    def __hash__(self):
        return hash(self._general_names)


@utils.register_interface(ExtensionType)
class IssuerAlternativeName(object):
    oid = ExtensionOID.ISSUER_ALTERNATIVE_NAME

    def __init__(self, general_names):
        self._general_names = GeneralNames(general_names)

    def __iter__(self):
        return iter(self._general_names)

    def __len__(self):
        return len(self._general_names)

    def get_values_for_type(self, type):
        return self._general_names.get_values_for_type(type)

    def __repr__(self):
        return ("<IssuerAlternativeName({0})>").format(self._general_names)

    def __eq__(self, other):
        if not isinstance(other, IssuerAlternativeName):
            return NotImplemented
        else:
            return self._general_names == other._general_names

    def __ne__(self, other):
        return not self == other

    def __getitem__(self, idx):
        return self._general_names[idx]

    def __hash__(self):
        return hash(self._general_names)


@utils.register_interface(ExtensionType)
class CertificateIssuer(object):
    oid = CRLEntryExtensionOID.CERTIFICATE_ISSUER

    def __init__(self, general_names):
        self._general_names = GeneralNames(general_names)

    def __iter__(self):
        return iter(self._general_names)

    def __len__(self):
        return len(self._general_names)

    def get_values_for_type(self, type):
        return self._general_names.get_values_for_type(type)

    def __repr__(self):
        return ("<CertificateIssuer({0})>").format(self._general_names)

    def __eq__(self, other):
        if not isinstance(other, CertificateIssuer):
            return NotImplemented
        else:
            return self._general_names == other._general_names

    def __ne__(self, other):
        return not self == other

    def __getitem__(self, idx):
        return self._general_names[idx]

    def __hash__(self):
        return hash(self._general_names)


@utils.register_interface(ExtensionType)
class CRLReason(object):
    oid = CRLEntryExtensionOID.CRL_REASON

    def __init__(self, reason):
        if not isinstance(reason, ReasonFlags):
            raise TypeError("reason must be an element from ReasonFlags")
        self._reason = reason

    def __repr__(self):
        return ("<CRLReason(reason={0})>").format(self._reason)

    def __eq__(self, other):
        if not isinstance(other, CRLReason):
            return NotImplemented
        else:
            return self.reason == other.reason

    def __ne__(self, other):
        return not self == other

    def __hash__(self):
        return hash(self.reason)

    reason = utils.read_only_property("_reason")


@utils.register_interface(ExtensionType)
class InvalidityDate(object):
    oid = CRLEntryExtensionOID.INVALIDITY_DATE

    def __init__(self, invalidity_date):
        if not isinstance(invalidity_date, datetime.datetime):
            raise TypeError("invalidity_date must be a datetime.datetime")
        self._invalidity_date = invalidity_date

    def __repr__(self):
        return ("<InvalidityDate(invalidity_date={0})>").format(self._invalidity_date)

    def __eq__(self, other):
        if not isinstance(other, InvalidityDate):
            return NotImplemented
        else:
            return self.invalidity_date == other.invalidity_date

    def __ne__(self, other):
        return not self == other

    def __hash__(self):
        return hash(self.invalidity_date)

    invalidity_date = utils.read_only_property("_invalidity_date")


@utils.register_interface(ExtensionType)
class PrecertificateSignedCertificateTimestamps(object):
    oid = ExtensionOID.PRECERT_SIGNED_CERTIFICATE_TIMESTAMPS

    def __init__(self, signed_certificate_timestamps):
        signed_certificate_timestamps = list(signed_certificate_timestamps)
        if not all(
            (
                isinstance(sct, SignedCertificateTimestamp)
                for sct in signed_certificate_timestamps
            )
        ):
            raise TypeError(
                "Every item in the signed_certificate_timestamps list must be a SignedCertificateTimestamp"
            )
        self._signed_certificate_timestamps = signed_certificate_timestamps

    def __iter__(self):
        return iter(self._signed_certificate_timestamps)

    def __len__(self):
        return len(self._signed_certificate_timestamps)

    def __getitem__(self, idx):
        return self._signed_certificate_timestamps[idx]

    def __repr__(self):
        return ("<PrecertificateSignedCertificateTimestamps({0})>").format(list(self))


@utils.register_interface(ExtensionType)
class UnrecognizedExtension(object):
    def __init__(self, oid, value):
        if not isinstance(oid, ObjectIdentifier):
            raise TypeError("oid must be an ObjectIdentifier")
        self._oid = oid
        self._value = value

    oid = utils.read_only_property("_oid")
    value = utils.read_only_property("_value")

    def __repr__(self):
        return ("<UnrecognizedExtension(oid={0.oid}, value={0.value!r})>").format(self)

    def __eq__(self, other):
        if not isinstance(other, UnrecognizedExtension):
            return NotImplemented
        else:
            return self.oid == other.oid and self.value == other.value

    def __ne__(self, other):
        return not self == other

    def __hash__(self):
        return hash((self.oid, self.value))
